Year % of children ages 12-23 months 1985 23 1986 20 1987 26 1988 30 1989 48 1990 79 1991 60 1992 70 1993 67 1994 78 1995 65 1996 60 1997 66 1998 67 1999 69 2000 70 2001 68 2002 66 2003 65 2004 63 2005 61 2006 66 2007 70 2008 66 2009 71 2010 68 2011 70 2012 74 2013 68 2014 65 2015 67 2016 68 2017 68 2018 68 2019 68 2020 65 2021 68 2022 68